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Phylogenetic tree of the 100 most abundant archaeal amoA OTUs recovered from the Gulf of Alaska. One representative of sequence group >97% identical is shown; the bar shows the number of sequences represented by an OTU, and the colors indicate the depth layer (Green tones: epipelagic; light blue tones: oxygen minimum zone; dark blue tones: bathypelagic). Reference sequences as well as environmental sequences from HAC- and LAC-amoA are included.
